What role does estrogen play during pregnancy?

Estrogen plays a crucial role during pregnancy, primarily by supporting the development of the fetal organs. This hormone is essential for the growth and maturation of the placenta and helps in the development of various organ systems in the fetus. Estrogen facilitates the blood flow to the uterus, ensuring that the developing fetus receives adequate nutrients and oxygen. Additionally, it assists in the regulation of other hormones that are vital throughout pregnancy.

While the other functions listed are important in different contexts, they do not primarily relate to estrogen's role during pregnancy. For example, milk production is primarily stimulated by prolactin, not estrogen. Hormonal balance during pregnancy involves several hormones working together, but estrogen's primary contribution focuses on fetal development. Similarly, while embryo implantation is a crucial phase, it is more directly influenced by progesterone and other factors than estrogen itself.